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Stock-Based Awards - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 20, 2016 shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) Employee shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option issuance period		10 years
Option vested period		1 year
Option issued period		Stock options may be issued for terms of ten years
Shares of common stock authorized to issue under equity award plan | shares	10,000,000
Stock-based compensation expense		$ 13,255	$ 14,717	$ 14,892
Tax benefit realized for the tax deductions for share-based compensation		2,364	7,684	12,877
Stock-based compensation expense as a result of modification to accelerate vesting of certain awards			$ 525
Number of employees to which modification to accelerate vesting of certain awards was made | Employee			20
Total intrinsic value of options exercised		4,218	$ 1,643	1,794
Cash received from option exercise		$ 191	$ 532	$ 195
Outstanding options | shares		570,537	1,158,828	1,368,247	1,544,597
Options remaining average contractual term		1 year 9 months 18 days
Options intrinsic value		$ 1,326
Income Tax Expense Benefit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit realized for the tax deductions for share-based compensation		3,015	$ 5,402	$ 5,324
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of awards that vested		$ 5,975	$ 18,285	$ 9,842

X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of employees to which modification to accelerate vesting of certain awards was made.

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